It sounds like it might be something with your setup if two chips in a row don't work. Can you please post a photo of your flashing setup? Also if you go to Preferences in Arduino and turn on "Verbose" for Uploading, can you please copy-paste the output you get when running "Burn Bootloader"?

I have the same problem, I have 2* ATMEGA328P chip with BOOTLOADER installed or that what the ad says, and both will not UPLoad any sketches.
Will I have to Upload the bootloader first even though it says the bootloader is preloaded.